Double contact relay



Nov. 17, 1931. H. RASSOW DOUBLE CONTACT RELAY Filed May 27, 1927 Fig. 4

" HETTTRassnw "Ian application of the relay as a rectifier.

Patented Nov. 17, 1931 UNITED STA TESM HORST RASSOW, OF BERLIN, GERMANY,ASSIGNOR TO SIEMEIVQ & HALSKE AKTIEN- GESELLSCHAFT, WERNERWEBK, OFSIEMENSST ADT, NEAR BERLIN, GERMANY DOUBLE CONTACT RELAY Applicationfiled May 27, 1927, Serial No. 194,828, and in Germany September 15,1926. I

This invention relates in general to polarized relays but more inparticular to double contact polarized relays, and the object is to makesuch relays more sensitive and eflicient in operation.

Double contact relays are known which have had the fixed contactslocated either on both sides of a point of rotation or both of them havebeen located on one side'of the rotatably mounted armature. In everycase at least one of the two fixed contacts required spring supports inorder that both contact pieces of the armature should make equally goodcontact. In that case it is impossible for both the fixed contacts toclose their circuits quite simultaneously. Furthermore bouncing oftenoccurs owing to the contact pressure not being quite uniform.

The present invention avoids these disadvantages, and at the same timehas the advantage that the movable parts have little weight and that allfriction at the bearings is done away with, this being achieved by somounting the armature and so associating the pole shoes with it, thatthe armature moves parallel to itselfand-therefore at right angles toits longitudinal axis. I

Arrangements of this kind have been known for operating loud speakingtelephones, which have the armature rigidly coupled to the telephonediaphragm and mounted on an elastic metal strip located in itslongitudinal axis. In that arrangement the armature is surrounded by thetelephone coil and its ends lie between the poles of two permanentmagnets placed in dissimilar directions. This arrangement could notdirectly serve as a model, because the two classes of apparatus havedifferent requirements and the very minute moving force of the armaturein the known device would be quite insufli cient to operate thecontacts. 1

The Figures 1 to 3 inclusive, show by wa of example, one method ofconstructin the novel double contact relay, while Fig. 4 s ows f Figure1 isi 'a section on the line II-II in Figure 2 Figure"2 is a section onII in 1 Figure 1; and Figure 3 is a side elevation.

Two permanent magnets 1 and 2 have their similar poles placed oppositeone another and connected by means of soft iron pole'shoes pole shownlies on the front side of the coil 6 opposite the bar shaped armature 5,and the other extension lies on the rear side of the coil but on theopposite side of the armature 5 from the first extension. The armatu l'p5, it will be noted, is surrounded by the co 6.

According to the polarity momentarily impressed on the armature 5 by thealternating current coil 6, the armature 5 is'drawn parallel to itselftowards the one or other pair of pole extension pieces 3", 4 or 3", 4:In known manner the pole shoe extension pieces can have their positionadjustable with respect to one another.

The cylindrical space 7 in the middle of the coil 6 is so large that thearmature 5 is quite free to move therein. Slots in the ends of thearmature contain insulating'plates 8 and 9, which have armature contacts10 on both sides and are suspended from metal bandsll, 12. The upperends of the metal bands are fixed into metal blocks 13, to whichthewires for conveying current to the contacts are connected. The blocks13 are mounted on a bridge 14, made of insulating material. The armaturecontact pieces 10 are connected to the bands 11 and 12 by means of theinsulating plates 8 and 9 which act as special strengthening pieces insuch a manner as to prevent the armature tipping between the fixedcontacts 15 and 16. For this purpose the upper end of the insulatingpiece 9 is widened. In addition on the other side a special.strengthening piece 17 is fastened to the lower part of the band 11. Onthe other side the band 11 is mounted .on the insulating plate 8 so asto be rotatable about the axis formed by the contact 10. The object ofthis is to enable the supporting band 11 to be. turned over in thedirection of the axis of the armature after the upper fastening 13 ofthe band has been loosened, thereby rendering it ill possible for thearmature to be drawn out of the coil 6 at *the other side.

Figure 4 shows a circuit arrangement, which permits the novel doublecontact relay to be used as a rectifier. An alternating current source18 is connected to a transformer 19, the secondary coil of which isconnected to the fixed contacts 15, 16' and 15', 16 of the armature 5.The apparatus consuming direct current, which in the example is shown tobe a battery 21 that is to be charged, is connected over a regulatingresistance 20 and over the supporting bands 11, 12 of the armature tothe latter. The energizing coil 6 surrounding the armature is connectedto the alternating current source 18 either in front of the transformer19 or over the transformer 19, a condenser 22 being preferably insertedin the circuit for the purpose of adjusting the phase. 1

What is claimed is:

1. In a polarized relay, a pair of permanent horse shoe magnets, a coilmounted be tween said magnets, an armature extending through the centerof said coil and controlled thereby, a pair of pole shoes attached tosaid magnets and disposed on each side of said coil, each end of saidarmature disposed between said pole shoes, and, a pair of elasticelectrical conducting bands, insulated from and supported by said poleshoes, and attached to each end of said armature for supporting thesame.

2. In a polarized relay, a pair of perma nent horse shoe magnets, a coilmounted between said magnets, an armature extending through the centerof said coil and controlled thereby, a pair of pole shoes attached tosaid magnets and disposed on each side of said coil, each end of saidarmature disposed between said pole shoes, and, a pair of elasticelectrical conducting bands, insulated from and supported by said poleshoes, and attached to each end of said armature, said elasticconducting bands attached to each end of said armature by means of fiatinsulating pieces and strengthening pieces on said bands.

3. In a polarized relay, 2. pair of permanent horse shoe magnets, a coilmounted between said magnets, an armature extendin through the center ofsaid coil and controlled thereby, a pair of pole shoes attached to saidmagnets anddisposed on each side of said coil, each end of said armaturedisposed between said pole shoes and a pair of elastic electricalconducting bands, insulated from and supported by said pole shoes, andattached to each end of said armature, said elastic conducting bandsattached to each end of sa1d armature by means of flat insulating piecesand strengthening pieces on said bands, one of said bands beingrotatably attached to sa1d armature to permit withdrawal of the armaturefrom said coil.

4. Ina relay, an armature passing through

